Re: [IRCA] Updated frequency offset for Tonga?
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Re: [IRCA] Updated frequency offset for Tonga?



I'll have to look again as to the reasoning for using higher frequencies for a reference. I thought that with the SDRs, it no longer made much of a difference, i.e. that an error of 1 Hertz at, say 21MHz, was the same as an error of 1 Hertz at 1MHz.

I'm sure that folks who have been paying better attention than I will put me right!

And, I do try for better accuracy than 1 Hertz myself. Darned technology is making too many DX stations too close to the exact frequency, so there is nothing unique about their signature.

best wishes,

Nick


At 13:21 31-07-13, you wrote:
I have the same experience during 10-15 years of using WWV/WWVH carrier as reference here in Finland: the shift caused by Doppler shift or spread by propagation is exaggerated. I often see it spread a bit, but it looks like being symmetrical, so there isn't any problem to see the centre anyway. Sometimes it can be one-sided and then I have noticed the centre being off by 1 Hz. But even if it were off by 2 Hz which I haven't noticed, it still makes an error of only 0.2 Hz at 1500 kHz, which is far better than using anything of MW as reference.

73, Mauno

29.7.2013 8:59, Nick Hall-Patch kirjoitti:
That's really intriguing Chuck.  Thanks for pointing that article out.

I wonder what causes the spread in the audio spectra that I often see when I get, say, a 400Hz beat to WWV at night? (compared to the more solid single frequency beat note that I usually see with something like KSL) This happens with my NetSDR and R8 so doesn't seem related to the radio used. The shifts may well average out to a single beat note, but it's pretty ugly on a second by second basis.

I'll have to find out where got the suggestion of using WWVB as a reference rather than the higher frequency standard stations, due to propagation anomalies.

best wishes,

Nick


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